$.extend($.fn.datagrid.methods, {

    autoMergeCells: function (jq, fields) {

        return jq.each(function () {

            var target = $(this);

            if (!fields) {

                fields = target.datagrid("getColumnFields");

            }

            var rows = target.datagrid("getRows");

            var i = 0,

            j = 0,

            temp = {};

            for (i; i < rows.length; i++) {

                var row = rows[i];

                j = 0;

                for (j; j < fields.length; j++) {

                    var field = fields[j];

                    var tf = temp[field];

                    if (!tf) {

                        tf = temp[field] = {};

                        tf[row[field]] = [i];

                    } else {

                        var tfv = tf[row[field]];

                        if (tfv) {

                            tfv.push(i);

                        } else {

                            tfv = tf[row[field]] = [i];

                        }

                    }
                }

            }

            $.each(temp, function (field, colunm) {

                $.each(colunm, function () {

                    var group = this;

 

                    if (group.length > 1) {

                        var before,

                        after,

                        megerIndex = group[0];

                        for (var i = 0; i < group.length; i++) {

                            before = group[i];

                            after = group[i + 1];

                            if (after && (after - before) == 1) {

                                continue;

                            }

                            var rowspan = before - megerIndex + 1;

                            if (rowspan > 1) {

                                target.datagrid('mergeCells', {

                                    index: megerIndex,

                                    field: field,

                                    rowspan: rowspan

                                });

                            }

                            if (after && (after - before) != 1) {

                                megerIndex = after;

                            }

                        }

                    }

                });

            });

        });

    }

});
